M4 rifle

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Solar eclipse of the sun.

The Sun Was Eaten: 6 Ways Cultures Have Explained Eclipses

African Americans demonstrating for voting rights in front of the White House as police and others watch, March 12, 1965. One sign reads, "We demand the right to vote everywhere." Voting Rights Act, civil rights.

Timeline of the American Civil Rights Movement

Moonrise over Tucson, Arizona

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Centimetres vs inches, metal rulers on a white background with clipping path.

15 Questions About Units of Measurement Answered

The Colosseum, Rome, Italy. Giant amphitheatre built in Rome under the Flavian emperors. (ancient architecture; architectural ruins)

New Seven Wonders of the World

Franklin D. Roosevelt, who formulated the Four Freedoms.

7 Alphabet Soup Agencies that Stuck Around

Calendar marking march 15th

What Is the “Ides” of March?

M4 rifle

firearm

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development of M16

In M16 rifle
…had largely transitioned to the M4, a carbine based on the AR-15 platform, as its primary infantry weapon.
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